Multiple diaphragm pump



2 Sheets-Sheet l March 2, 1954 A. GUIOT MULTIPLE DIAPHRAGM PUMP Filed Deo. I12, 1951 March 2, 1954 A GUlOT 2,670,691

MULTIPLE. DIAPHRAGM PUMP Filed Dec. 12, V1951 2 sheets-sheet 2 ATM/Mfrs Patented Mar. 2, 1954 MULTIPLE DIAPHRAGM PUMP Auguste Guiot, Paris, France, assignor to Etablissements Guiot, Paris, France, a society of France Application December 12, 1951, Serial No. 261,355

Claims priority, application France December 21, 1950 The present invention relates to multiple diaphragm pumps of the kind including at least two diaphragms at a distance from each other and housed in a pump body in such manner that between each of the side walls ofvv said body and each of the diaphragms there is formed a chamber in communication, through suitable valve means, with the uid (either liquid or gaseous) intake conduit and with the fluid discharge conduit, the space between the diaphragms serving to house the pump driving means through which the reciprocating displacements of said diaphragms are obtained. i

The object of the present invention is to provide a pump of this type which is better adapted to meet the requirements of practice than those known at the present time, and in particular which has a substantially continuous delivery and is easier to manufacture.

My invention consists chiey in constituting the pump driving means by at least one eccentric disposed in the space existing between the diaphragms, this eccentric being locatedv inside parallel annular parts which are respectively rigid with the respective diaphragms and the edges of which are kept in contact with the eccentric through elastic means whereby continuous rotation of the eccentric causes successive displacements 0f the respective diaphragms in the direction of suction when the projecting portion of .f

the eccentric is moving along the inner edge of the annular part toward the point thereof which is at the greatest distance from the diaphragm in question, and successive displacements of these membranes in the discharge direction are obtained through the eiect of elastic means and when the projecting portion of the eccentric moves away from said point.

Other features of my invention will appear in the course of the following description of some embodiments thereof with reference to the accompanying drawings, given merely by way of example and in which:

Figs. 1, 2 and 3 show, respectively in vertical axial section, in plan view (with portions cut away and portions in horizontal axial section), and in cross section on the line III-II of Fig'. l, a diaphragm pump according to the invention.

Fig. 4 is a section, similar to Fig. 3, of a modication.

Referring first to Figs. 1 to 3, the pump includes two parallel diaphragms I and 2 housed in the body 3 of the pump so as to leave a space li between them. Each diaphragm is constituted by a sheet of circular outline made of a flexible ma- 1 claim. (c1. 10s-15o) terial such as a plastic matter, leather, natural or synthetic rubber and so on, this sheet carrying on one of its faces adisc 5 of metal or ani other rigid material which covers nearly all the area of the face in question.

The edge of this sheet is tightly held between the pump body proper and a side plate fixed in a removable manner on said body 3, for instance by means of screws or bolts. As the pump includes two diaphragms i and 2, they are located 5 on either side oi the body proper 3 and are held in position by two removable side plates 6 and l, respectively.

Between the outer face of each diaphragm I, 2 on which is applied metallic disc 5 and the wall of the corresponding side plate, there is formed a chamber B (Fig. 3), 9 (Fig. 2) intorwhich flows the fuel to be delivered, Chambers 8 and 9 may be put in communication, through passages such as IB and II (Fig. 2) provided in the pump body. with a common intake I2 and through similar passages such as I'3 and i4 (Fig. 3) with a common outlet I5. In passages II are provided automatic inlet valves I6 and in passages i3 automatic delivery valves Il, At the places where the diaphragms extend across passages l 3, one or several holes I3a are provided in these diaphragms.

In the space 4 between the twodiaphragms I and 2 is housed the mechanism through which are obtained the reciprocating movements of said diaphragms and, according to the invention, this mechanism is arranged in such manner that the diaphragms act successively to draw in the liquid into chambers 8 and 9 alternately. Likewise, the liquid is discharged from these chambers alternately. vFor this purpose, I make use of an eccentric I8 mounted at the end of shaft IS extending into the body 3 of the pump through one wall thereof so that the axis of this shaft is in the vertical plane of symmetry of said body and intersects the straight line passing through the re,- spective centers of diaphragms I and 2.

' A circular ring Isa is journalled on eccentric I3 with the interposition of a roller bearing |811 (Fig. l). Shaft i9 is driven by a suitable motor, for instance an individual electric motor 26, through a speed reducing gear 2 l.

On the inner face oi each diaphragm i, 2, and in particular on a disc 5a carried by this face, are xed, close to the center of the membrane, one or several flat annular parts which surround eccentric i8.

In the example shown, diaphragm 2 carries two annular parts 22 and 23 adjoining each other along a plane passing through a diameter of this diaphragm 2. Diaphragm I carries two similar parts 24 and 25 located on either side of parts 22-23 and slightly distant therefrom. Of course, parts 22 and 23 might be combined into a single one.

These annular parts are xed to the metallic discs 5a of the corresponding diaphragms through suitable means, either in a removable manner and for instance as shown by means of pins 23 engaged in lugs 2I provided on the .inner faces of these discs and in holes provided in said parts, or permanently, for instance by Welding 'on discs 5a.

Eccentric I3 extends at least over the lwidth of the whole of the parallel and juxtaposed annular parts 22 to 25, so that it can act, when-turning, on these parts in the manner hereinafter described.

Every at annular part forms an aperture the diameter of which is greater than that of the eccentric and the inner edge of which is provided, advantageously but not necessarily, with a flat projection 28, 29 located in the portion of said inner edge at the maximum distance from the corresponding diaphragm 2;, I. The flat projections 28 of parts 22 and 23 are therefore located on the left of eccentric I8 (Fig. 3) and the flat projections of parts 23 and 25 on the right 'of Vthis eccentric.

Between diaphragms I and 2, or rather between their discs 5a, I interpose a plurality of lhelical springs 30, for instance two springs disposed in a diametral plane of the diaphragms and the ends of which are engaged on projections 3| of the inner faces of discs 5a. Owing Vto theaction of these springs, the inner edges of annular parts 22--23-24-25 remain constantly in contact with the eccentric at points located inthe axial plane of shaft I9 Vwhich is parallel to the axes of springs 30. l

In Fig. 1, 32 designates a roller bearing housed -in `the pump body 3 and in which shaft I9 is journalled; 33 and 34 are lubrication conduits, closed by a plug 35.

The pump thus constituted works as follows: Motor drives shaft I9 and eccentric I8. The projecting portion (i. e. the portion of maximum radius) of the eccentric comes for instance in contact first with the flat projections 29 of annular parts 24 and 25 which are carried by diaphragm I, and this diaphragm is pulled toward the right of Fig. 3, which increases the volume o f chamber 8. Fuel is therefore drawn into this chamber through passages I2, I0 and Il, the vcorresponding valve I6 opening automatically. 'Simultaneously with this, diaphragm I exerts, through springs 30, a thrust on diaphragm 2 which is therefore also moved toward the right, thus reducing the volume of chamber 9. The V'fuel present in said chamber is expelled past 'valve I'I and through passages I3, i4 and I5 toward the place where it is to be used. When the eccentric has rotated through 180, its portion of maximum eccentricity acts upon the flat projections 28 of annular parts 22 and 23, which 'pulls diaphragm 2 toward the right hand side of Fig. 3, so that fuel is now drawn into chamber 9. Simultaneously this diaphragm 2 pushes, through springs 30, diaphragm l in the same direction, thus causing the fuel previously admitted into chamber 8 to be expelled from the pump. Chambers 8 and 9 therefore successively admit fuel and discharge it, in alternating fashlon.

Of course, I might, according to my invention, distribute any desired number of diaphragms 'about shaft I9-, these diaphragms being located in planes parallel to the axis of this shaft and at the same distance therefrom, the suction and delivery strokes taking place, when the eccentric is rotating, in response to the cooperation of the portion of maximum radius of this eccentric with projections, such as 2B and 29, of annular parts rigid with the respectvevdlaphragms.

Fig. 4 shows an embodiment of my invention which, for most of its elements, is similar to that above described. The feature which differentiates this construction from that of Figs. 1 to 3 is that, in order to keep every annular part 22, 24 in contact with eccentric I8, I make use of a helical pulling'spring 40 one end of which is fixed at 4| to the centerof the outer disc 5 of the corresponding diaphragm. The other end of this spring is fixed to the pump body, for instance to a pin 42 disposed diametrically in a tubular portion 43 of the side plate 6 (or 1) of the pump body. A cap 44 is screwed on said tubular portion 4,3.

In the example shown, the action of spring 40 is of predetermined force, but it might of course be made adjustable.

It is clear that the pull exerted by spring 40 on the corresponding diaphragm I or 2 constantly keeps the at edge 28 or 29 of annular part 22 or 24 in contact with eccentric IB.

Such a spring arrangement has the advantage of dispensing with the presence of compression springs in the central portion of the pump, where it may be diiiicult to house them when the pump includes more than two diaphragms.

Furthermore, this arrangement makes it possible to use an odd number of diaphragms, since it is no longer necessary to group them in pairs of two diaphragms facing each other.

Finally, springs 40 are easily reached and adjusted if necessary.

In all cases, a pump according to my invention has the advantage of running at the desired speed noiselessly and Without requiring much power. It supplies uid instantaneously and in a practically continuous manner. Its operation does not depend upon the physical conditions of the huid.

In a general manner, While I have, in the above description, disclosed what I deem to be practical and efficient embodiments of my invention, it should be well understood that I do not wish to be limited thereto as there might be changes made in the arrangement, disposition and form of the parts without departing from the principle of the present invention as comprehended Within the scope of the accompanying claim.

What I claim is:

A pump which comprises, in combination, a pump body, at least two diaphragme in said body disposed at a distance from each other so as to leave an interval between them and having their edges Sxed to the inner wall of said body so as to form with said body a variable volume chamber on either side of said interval, a iuid inlet and a fluid outlet carried by said body, conduits in said body arranged to connect each of said chambers with said nuid inlet and said fluid outlet, intake and delivery valves in said conduitst annular parts carried by said diaphragms in nxcd positions with respect thereto respectively on the sides thereof turned toward each other, the inner contour cf each of said annular parts including a nat inward projection extending parallel to the diaphragm which carries said part in the portion ci said lcontour which is at the greatest distance from said last .mentioned diaphragm, a shaft iournalled in said body having its axis 2,670,691 5 parallel to both of said diaphragms and located in said interval, an eccentric carried by said shaft engaged inside said annular parts, and spring means for urging against said eccentric the flat Number projection of each annular part which is at the 5 2139571 greatest distance from the diaphragm which 2,419,775 carries said annular part, said spring means in- 2,491,230'

cluding a pulling spring interposed between the outer face of each diaphragm and the pump body, N b

to urge said diaphragm away from said eccentric. 10 3tlg-sgg() AUGUSTE GUIOT.

References Cited in the file of this patent UNITED STATES PATENTS Name Date Avigdor Dec. 6, 1938 Hazard Apr. 29, 1947 Theis Dec. 13, 1949 FOREIGN PATENTS Country Date Great Britain Jan. 12, 1933 

